Re: Observations after upgrading to latest Firefly (0.80.11)

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On Thu, Jan 14, 2016 at 12:50 AM, Kostis Fardelas <dante1234@xxxxxxxxx> wrote:
> Hello cephers,
> after being on 0.80.10 for a while, we upgraded to 0.80.11 and we
> noticed the following things:
> a. ~13% paxos refresh latency increase (from about 0.015 to 0.017 on average)
> b. ~15% paxos commit latency ( from 0.019 to 0.022 on average)
> c. osd commitcycle latencies were decreased and very much stabilized
> after the upgrade. Cannot say right now if it was the upgrade per se
> that did it or the OSDs rolling reboot

This is probably a combination of the reboot and (I'm just going
through the changelog here) the journal block alignment patch.

Nothing apparent that would have changed the monitor stuff; there were
a lot of fixes but I suspect it's just the reboot or noise in your
data stream.
-Greg

>
> Are you aware of the changes/improvements in code in 0.80.11 that may
> have caused this issue?
>
> [1] https://ceph.com/releases/v0-80-11-firefly-released/
>
> Regards,
> Kostis
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